IEC 60904-1-1-2017 pdf free
IEC 60904-1-1-2017 pdf free.Photovoltaic devices – Part 1-1: Measurement of current-voltage characteristics of multi-junction photovoltaic (PV) devices.
This part of IEC 60904 describes procedures for the measurement of the current-voltage characteristics of multi-junction photovoltaic devices in natural or simulated sunlight. It is applicable to single PV cells, sub-assemblies of such cells or entire PV modules, It is principally intended for non-concentrating devices, but parts may be applicable also to concentrating multi-junction PV devices. An essential prerequisite is the spectral responsivity of the multi-junction devices, whose measurement is covered by IEC 60904-8-1.
The requirements for measurement of current-voltage characteristics of single-junction PV devices are covered by IEC 60904-1 whereas this document describes the additional requirements for the measurement of current-voltage characteristics of multi-junction PV devices.
This document may be applicable to PV devices designed for use under concentrated irradiation if they are measured without the optics for concentration and irradiated using direct normal irradiance and a mismatch correction with respect to a direct normal reference spectral irradiance distribution is performed. The reference spectral irradiance distribution is provided in IEC 60904-3
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC TS 61836 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
current limiting junction
junction in a multi-junction photovoltaic device in which under given illumination conditions the lowest photovoltaic current is generated
4 General considerations
The procedure for measurement of the current-voltage characteristics of single-junction PV devices is described in detail in IEC 60904-1. The procedure for measurement of the current- voltage characteristics of a multi-junction PV device is based on the same basic principles, but requires some additional elements, which are described herein.
This document describes the additional considerations, requirements and procedures for the measurement of the current-voltage characteristics of multi-junction PV devices based on the measurement principles of single-junction PV devices.
Therefore, the provisions in IEC 60904-1 are also valid for the measurement of multi-junction PV devices except where explicitly amended by this document.
Multi-junction PV devices consist of two or more series-connected junctions. In general it is only possible to determine the current-voltage characteristics of the entire device. However, it may be useful to quantify the photovoltaic current associated with each individual junction and excessive variation of current with voltage in the current-voltage characteristics between the short-circuit and maximum-power point that may indicate shunting of each junction. To understand the performance of a multi-junction device under different spectra it is helpful to characterize each junction within it.IEC 60904-1-1 pdf free download.
